Safety lock for doors



y 1931. M. F. RUIZ SAFETY LOCK FOR DOORS Filed March 20, 1930 PatentedMay 5, 1931 ETED STATES MARIO F. RUIZ, OF GUANABAGOA, CUBA.

SAFETY LOCK FOR DOORS Application filed March 20, 1930. Serial No.437,440.

This invention relates to looks and has for an object the provision ofan improved construction which prevents a burglar or other unauthorizedperson from forcing the bolt back after it has been projected into itskeeper.

Another object is to provide a sliding plate acted on by levers by themotion of the bolt itself when the door is closed and that will shieldthe bolt from being shoved back into its casing by any one pushing uponthe inclined surface of the bolt.

In the accompanying drawings Figure 1 is a front view of the lock.

Figure 2 is a side section of the lock through line 2-2 of Figure 1,when the door is closed, showing position of levers and shield plate.

Figure 3 is a front section of lock through line 33 of Figure 1 when thedoor is closed showing front view of keeper or shield casing.

Figure 4 is a side section of the look through line 22 of Figure 1 atthe moment the bolt is drawn into its casing to open the door, showinposition of the levers and shield plate.

Figure 5 is a perspective view of the lever in the bolt case.

Figures 6 and 7 are different views of the lever in the keeper or shieldcase.

Figure 8 is a perspective view of the shield plate.

Referring to the accompanying drawing, number 1 shows the bolt case ofthe lock on the door 3 and 2 is the keeper or shield case on the jamb ofthe door 4: both held in place by means of screws, casing 1 containingany suitable mechanism for operating the bolt 8, a handle being used fordrawing the bolt from the inside while a suitable key may be providedfor withdrawing the bolt from the outside and not shown as it forms nopart of the present invention.

The bolt 8 has a beveled or inclined face as is usual with bolts of thiskind and is acted on by means of the usual spring that will allow thebolt to be forced back into its case as the door is slammed. Thepermanent position of the bolt is that shown in Figure 2.

The operation of the lock is as follows: considering the normal positionof the bolt 8 as shown in Figure 2 with the door closed. We have thebolt acting on two levers 9 pivoted at 7 on'the side wall of bolt casingand 20 pivoted at 19 on the side wall of keeper or shield casing. As canreadily be seen in Figure 2, the bolt 8 is in normal position when thedoor is closed. As the bolt is drawn back into its case to open the doorit will disengage the end of the lever 20 in shield casing which is heldin place by the bolt and by means of lever 9 in the bolt casing one ofwhose end slides inside groove 10 in the bolt, its other end will thenmove forward as the bolt is drawn backwards, thus causing the metalplate or shield 15 to slide back into its casing and the door is free toopen.

Then again as the door is being closed the bolt pushing forward into thekeeper or shield case will act upon one end of lever 20 on the keeper orshield case, causing the other end of the lever 20 working in a slot inthe shield or metal plate 15 to slide out of its casing toward the boltcasing at the same time that the reciprocate motion imparted by themotion of the bolt to lever 9 in bolt casing allows free motion to saidplate and thus establishing a protection for the bolt from beingtampered with from the outside by any instrument or contrivance placedber tween the door and the jamb and pushing against the beveled face ofthe bolt.

What I claim is:

1. In a lock of the character described, the combination with a lockingmechanism including a bolt having a beveled face and in its stem a camgroove, of a lever pivoted in the bolt casing and engaging at one endthe cam groove of the bolt, a metal plate or shield slidable in thekeeper, and a lever pivoted in the keeper and connected to the shield,so that the bolt in its forward movement engages the second lever whichcauses the plate or shield to slide out of the keeper into the boltcasing, thus protecting the bolt from any object placed between the doorand door j amb from the outside.

2. In a lock of the character described, the combination with a lockingmechanism including a bolt having a beveled face and in its stem a camgroove, of a lever pivotally mounted in the bolt casing and engaging atone end the cam groove of the bolt stem, a metal shield slidably mountedin the keeper, a lever pivotally mounted in the keeper and in line withthe opening between the keeper and the locking mechanism, one of thearms of the second lever engaging an opening in the shield, so that thebolt in its forward movement will engage the free end ofthe secondlever, causing the shield to slide out of the keeper into the boltcasing, thus protecting the bolt from any object placed between the doorand door jamb from the outside, and in the backward movement of the boltthe free end of the first lever will push the shield into the keeper.

3. In a lock of the character described, the combination with a lockingmechanism including a bolt having a beveled face and in its stem a camgroove, of a lever pivotally mounted in the bolt casing and having oneof its arms engaging the cam groove of the bolt stem, a metal shieldslidably mounted in a hollow of the keeper, a lever pivotally mounted inthe keeper and having one of its arms engaging an opening in the shieldand having its other arm in line with the opening between the keeper andthe locking in its forward movement will engage the aligned arm of thesecond lever causing the shield to slide out of the keeper into the boltcasing, thus protecting the bolt from any object placed between the doorand door jamb from the outside, and in the backward movement of the boltthe free end of the first lever will push the shield into the keeper.

In Witness whereof I flfl'lX my signature.

MARIO F. RUIZ.

